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A. RUPP.

PROPELLER.

APPLICATION r1150 n. 18. 1919.

1,318,805. Patented 001. 14,1919.

3 SHEETS-SHEET l- In vem or THE COLUMBIA PLANouR/mu co WASHINGTON. D. c.

A. RUPP.

' PROPELLER. APPLICATION FILL ED MAR. 18. 1919.

1,318,805. Patented Oct. 14,1919.

3 SHEETS-SHEET 2.

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I Ame/$7131 v ms 4mg,

1 Amnr'mnn cn, WASHINGTON. n. c.

- A. RUPP.

PROPE'LLER. APPLICATION FILED Mn.l8.1'919. 1,318,805. 4 Patented 0ct.14,1919. I s SHEETSSHEET All? Aih nag u oLuMnm PLANOGRAPII an, WASHINGTON. n. C.

l ,1 i means: for quickly; and securely attaching the propeller to themotor'shaft, and the in- Tojallltv hom may concern;

Be it known that I; ALBERT Burr, citizen ofthe Swiss Confederation, and residing at Eichbuhl, near Thun, Switzerland, have in vented certain new and useful Improvemerits in Propellers of which the following is 'elspe ioni present invention has reference to n w anduseful improvements in propellers andf relatesfmore particularly to improved vention is directed to improved meansfirstly for clamping the propeller boss between two flanges, secondly for jamming one of i flanges against the propeller, thirdly for connecting the other flange to the motor shaft, and fourthly for interconnecting the tw zfla gcs.

,1; invention .will best be understood when described in connection withthe accompanying drawings in which Figures 1, 3; 4L and ,6; represent axial sections through as many constructional modifications of propeller sevsralfigures. i

.....Beferring first to Fig. 1 the. reference connections according to. my invention; Fig. 2 is. asection on line II-II of Fig. 1; Fig. .5 is a section on lineV-V of Fig; 4, and tlieFFigss 7-10 represent detail parts of the modification according toFig. 6. Like ref- ..erence numerals denote; like parts i in the 1 de otes the shaft end, 2 the propeller hub, and 3 and respectivelythe two flanges between which the propeller is to be (clamped. The flange disk 3 is connected to V: 5 .thefflangedisk 5 of the motor shaft by a plurality of screw bolts'o." The flanges are :provided intermediate the bores for these bolt s,6 with bores .7 and 8 respectively,

through 5 which are "passed countersunk bolts l O rhaving' conically', tapering heads:..9. A nut 11 threads on the outer end ,offtliese bolts 10am the fiange 3 is clamped between the nutsll and the annular gshoulders L presented the enlarged heads 9a These conical heads, 9 snuglyfit into registering bores in the .propeller'rboss,

.as .at 12,:so that the (propeller istaken along p," J: he. motor shaft being rotated. The

@flange member 3jforms an integral part of the hollow hub 13. which latter, passes through the central bore 14 of the propeller andis provided on the outer cir- ,cumference of its, contracted forward end I i with longitudinalgrooves 15 and on the PROPELLER.

respective inner Wall with a screw thread inner W ll of the central; bor o fithg flange 4 is provided with longitudinally di rected ribs 17 which dovetail with the grooves 15 in the hub end; sothat' the 1 can be displaced on the hubjend in tudinal but notjin angular direction.

I to h th d 6. Screws the one; e df 8 of a b e ppl 8 nd s cur d a gst working loose in suitable in-anner.v ljor Specification of Letters Patent. Patented? Oct, '14 Application fi1ed March 18,1919. seri in rzsa os.

pressingthe flanget against th p 'd n cheek a 15 ay o cl mpi g. the latter between the two flange members 3 1, there is provided a hollow conical" head- 19 and a, lock a nut 20. lTh e large e'rid fifth? cone member engages behind an annular which: is"provided with ai fiangie 20; is screwed onto the free end 18", 'offth'e n pple 18, ts flange 20, and an interposed shoulder 21 in the" flange. The lock mime,

Packing P e 22 pressing against the fiafitamed mull-116d ex ofth cone, cl mpin thereby the several parts. I The lock nut-.20 s secured against inadvertently beco nin" detached by a cotter or split pin 23 whic,

is driven throughalined perforations int he nut wall and registering'fcastellations the front end ofthe nipple-l8. f e In the construction according" to Fig.

the flangemember 3 is. screwed 0. left-1 5.3

ed t t a n h hub l lbs i'tieEQ iS P l thehub shoulder 26. l'lhe use o f a left thread has the advantage that the propeller cannot work loose. betweentheflanges, as

the flange?) is caused to be displaced toward the'flange 4: by the reaction-of the propeller. The hub-13 1s conically boredoutfandii's against relative rotation on the conical portion 2-8 of the motor shaft means jf thekey 2.7. The motor shaft, terminates in a threaded portion 29 with a serieso'ffa i- H nularly disposed tonguesBO for the passage of the cotter pin 23. The 1 11101 13. termi- Dates in an annular cup-sh'aped housing 31,

Ypres'enting a shoulder 82 close against which is'screwe'd a nut 33, whereby the'hub isfsecured fo n, tl1e propeller shaft agail'rstlong j tudinal displacementf QThe "boss of flange t is shoved over the'hofusing 31' and a' ring member 34: of hexagonal openingsecured to the flange grips the hexagonfnut 33 and thereby prevent the latter "from becoming loosened. The lock nut 20 screws onto the threaded shaft end 29, the parts beingsubstantially constructed and cooperating "as above described with reference to Fig. l.

This latter construction has the advantage over the first above described arrangement that if the propeller should accidentally strike the ground and the flange 4 should in consequence have become distorted, it would be necessary to replace only this flange and not the entire hub.

The same advantage is obtained by the construction according to- Figs. 4L and 5, in which the flange 3 is screwed directly onto a left threaded portion 35 of the motor shaft 1, which latter has an integral shoulder 36, a jam nut 37, which may itself be secured against working loose for instance by a set screw 37, preventing the flange from unscrewing. The flange t is seated on a substantially square collar portion 38 of the shaft and is thereby prevented from relative rotation. The forward end of the propeller shaft is provided with a thread 39 onto which screws the lock nut 20, as abov described in detail.

The construction shown in Fi 's. 69 is a combination of the two modi re ations of Figs. 1 and 3, in as far as here the flange 3 is integral with the hub 13". The flange 3 is provided with radially or peripherally disposed teeth 3 which engage in the wood of the propeller, forming thereby a reliable relative connection. The hub 13 is secured to the conical part 28 of the shaft 1, as described in connection with Fig. 3, but the thread portion 29 of the haft here is relatively short and cooperates with a cap nut 33. The cup shaped enlargement 31 of the hub 13 which supports the flange at is extended forwardly with an external thread 40 and terminates in axially extending teeth 4.1. Into the recess between these teeth 41 engage similar teeth 43 correspondingly extending from the inner face of a lock cap 42 (Fig. 10). The latter is provided internally with a 'dodecagonal flan e 4-1 which snugly fits over the correspondingly faced cap nut 33 and is secured in position by a central screw 45. Rotation of this castellated lock cap *2 relative to the hub and to themotor shaft is thus effectively prevented, as is also inadvertent loosening of the cap nut 33'. Thelock cap 20", which by means of its flangeQO jams the cone head 19 against the flange 4, screws not onto the motor shaft as in the other constructions, but onto the threaded portion 40 of the hub cup-extension 31, andscrew bolts f6 passing through the cap flange 20 and the contacting inturned cone rim prevent the cap 20 from working loose.

This construction has the advantage that the load acting on the lock cap for the attachment of the propeller is not directly transmittedto a relatively small portion of the motor shaft.

Over prior constructions for securing the propeller to its shaft by means of bolts passing clear through the propeller my invention has the important advantage that for mounting or demounting the propeller only a single, centrally located screw (lock cap) need be manipulated. Owing to the centrically directed pressure of the lock cap, of the cone member, and of the flange 4 the propeller is pressed home uniformly allaround onto the hub or the flange 3 respectively which prevents one-sided cut-under or tilting of the propeller.

Furthermore a saving in propeller hubs is effected, since there is required a hub only for each motor and not, as heretofore, for each propeller. In demounting a propeller hub from the motor shaft it now often happens that the latter is injured, which need not be feared with my constructions. Aside from a considerable saving in material, there is also a large saving of time in mounting and demounting a propeller as proposed by me above.

The invention, obviously, is susceptible of various other modifications and hence I do not want to be understood as limiting myself specifically to the construction and a1- rangements of parts shown and described, and I must be allowed to reserve myself theright to make changes in the form, proportion and the minor details of construction without departing from the principle or sacrificing any of the advantages of my invention.

lVhat I claim is 1. In a propeller fastening, in combination with a propeller, two flanges designed to clamp said propeller between them, a coaxially disposed cone-shaped member, a lock nut pressing said cone-shaped member against one of said flanges, and means operatively connecting said lock nut to the other flange through the central propeller bore, substantially as set forth.

2. In a propeller fastening, in combination with a propeller, two flanges adapted to clamp the propeller between them, a coneshaped member, a lock nut screwing on the one end of a double nipple whose other end screws into a hub, and said lock nut designed to press said coneshaped member against one of said flanges, the said two flanges being supported on said hub, and means for rigidly connecting the hub to the motor shaft.

3. In a propeller fastening, in combination, a propeller shaft, two flanges concenfor preventing relative rotation between this second flange and said propeller shaft, a

I shaft, a terminal flange thereon, a propeller having a central boss bore clear through and a series of relatively short side bores in its one boss face arranged in a circle about the central bore, a hub extending through said propeller bore, a terminal flange on said hub and means for connecting said two flanges, means held in and extending through said two connected flanges and engaging in said side bores of the propeller boss, a constricted front end to saidhub with grooves on the outside, a screw thread on the inside of said constricted hub end, a double nipple screwing with one end into the constricted front end of said hub, a flanged lock nut screwing onto the other end of said nipple, and means for preventing relative rotation between nipple and nut,

a flangemember dovetailedly supported on the grooved constricted end of said hub and contacting with the propeller hub, and a cone-shaped member interposed between the last named flange member and the said flanged lock nut, the parts being constructed,

arranged and cooperating substantially as shown and described.

' ALBERT RUPP.

copies of this patent may'be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. G. 

